The shows, films, comics, and video games on this list inspired incredibly dedicated fans, whose unparalleled enthusiasm led to numerous spin-offs and reboots, and countless flamewars. These fandoms are rife with ship wars, pretentious hierarchies, aggressive idolization of actors, or stubborn arguments about the "best" generation. These intense fandoms have the potential to keep otherwise levelheaded enthusiasts from enjoying these series, and may even scare off new fans who were just looking for something fresh in their Netflix queue.

While these nerd favorites are near and dear to many hearts and boast the longest lines Comic-con has ever seen, it’s best to tread their fandoms lightly, or risk losing not only your interest, but your temper.